package cn.tedu.sp11.fallback;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {
    /**
     * 返回一个字符串,返回的为ServiceId
     * 表示这个降级类是针对哪个服务进行降级
     */
    @Override
    public String getRoute() {
        //return "*"; //针对所有服务
        //return null; //也是针对所有服务
        return "item-service"; //针对item-service服务进行降级
    }

    /**
     * 降级实现
     * @param route
     * @param cause
     */
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        //返回降级的响应
        //在response对象中,要设置http协议的状态码,协议头,协议体
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }
            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }
            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }
            @Override
            public void close() {}
            @Override
            public InputStream getBody() throws IOException {
                String json = JsonResult.err().msg("调用商品服务失败!").toString();
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }
            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders headers = new HttpHeaders();
                headers.setContentType(MediaType.APPLICATION_JSON);
                return headers;
            }
        };
    }
}
